CG for Flying saucer

[rcKeith]

Hi

A flying buddy of mine has built a flying saucer from a plan he's enlarged by  20 %.  He used the CG of the 20% enlarged plan.  It does fly but seem very tail heavy.  I've wondered whether  just using the CG as marked on the 20% enlarged plan is right,  I've used some of the on-line calculators for traditional models and that works OK but finding the MAC and Neutral Point of a saucer doesn't seem easy.  Does anyone have any suggestions 

 

Thanks

 

Keith 

[r6dan]

If it flys and is not uncontrollable,just keep moving something like the battery forward a touch until it  flys flat.